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`M <br /> d <br /> r' <br /> Photo 6— Same location as photos 4 and 5. Spalling of sandstone cliff face at top of Box Canyon. <br /> Pre-subsidence surveys(in operator's subsidence reports) documented this spalling prior to being <br /> undermined. 2008 subsidence reports document more spalling that occurred after undermining. <br /> 9 <br />